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RC5057 数据表(PDF) 4 Page - Fairchild Semiconductor

部件名 RC5057
功能描述  High Performance Programmable Synchronous DC-DC Controller for Low Voltage Microprocessors
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

RC5057 数据表(HTML) 4 Page - Fairchild Semiconductor

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RC5057
PRODUCT SPECIFICATION
4
REV. 1.2.0 2/10/00
Electrical Specifications (V
CCA = 5V, VCCP = 12V, VOUT = 2.0V, and TA = +25°C using circuit in Figure 1,
unless otherwise noted.)
The • denotes specifications which apply over the full operating temperature range.
Notes:
1. Steady State Voltage Regulation includes Initial Voltage Setpoint, Droop, Output Ripple and Output Temperature Drift and is
measured at the converter’s VFB sense point.
2. As measured at the converter’s VFB sense point. For motherboard applications, the PCB layout should exhibit no more than
0.5m
Ω trace resistance between the converter’s output capacitors and the CPU. Remote sensing should be used for optimal
performance.
3. Using the VFB pin for remote sensing of the converter’s output at the load, the converter will be in compliance with Intel’s
VRM 8.4 specification of +50, -80mV. If Intel specifications on maximum plane resistance from the converter’s output capac-
itors to the CPU are met, the specification of +40, -70mV at the capacitors will also be met.
4. Includes gate current.
Parameter
Conditions
Min.
Typ.
Max.
Units
Output Voltage
See Table 1
1.3
3.5
V
Output Current
18
A
Initial Voltage Setpoint
ILOAD = 0.8A, VOUT = 2.400V
VOUT = 2.000V
VOUT = 1.550V
2.394
2.000
1.550
2.424
2.020
1.565
2.454
2.040
1.580
V
V
V
Output Temperature Drift
TA = 0 to 70°C, VOUT = 2.000V
VOUT = 1.550V
+8
+6
mV
mV
Line Regulation
VCCA = 4.75V to 5.25V, VOUT = 2.000V
±2
mV
Internal Droop3
VOUT at ILOAD = 0.8A to Imax
-44
-40
-36
mV
Output Ripple
20MHz BW, ILOAD = Imax
11
mVpk
Total Output Variation,
Steady State1
VOUT = 2.000V
VOUT = 1.550V3
1.940
1.480
2.070
1.590
V
Total Output Variation,
Transient2
ILOAD = 0.8A to Imax,VOUT = 2.000V
VOUT = 1.550V3
1.900
1.480
2.100
1.590
V
Short Circuit Detect Current
45
60
µA
Efficiency
ILOAD = Imax, VOUT = 2.0V
85
%
Output Driver Rise & Fall Time
See Figure 4 for tR and tF
50
nsec
Output Driver Deadtime
See Figure 7 for tDT
50
nsec
Oscillator Frequency
255
300
345
kHz
Duty Cycle
0
100
%
PWRGD Threshold
Logic HIGH
Logic LOW
93
88
107
112
%Vout
VCCA UVLO
3.74
4
4.26
V
VCCP UVLO
7.65
8.5
9.35
V
VCCA Supply Current
19
mA
VCCP Supply Current4
40
mA
Soft Start Current
510
17
µA


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